A suspect, 38-year-old Victor Peña of Charlestown, has been arrested and charged with kidnapping, according to Boston Police Commissioner William Gross. He said Ambrose was found in Peña's apartment.

"She's very strong," Heather Ambrose, Olivia's mother, told NBC10 Boston after returning with her daughter to the family home in Wenham, Massachusetts. "It's going to be a process, but she's OK."

An Ambrose family spokesperson issued a statement expressing their gratitude toward police and others who aided in the search.

"The Ambrose family is so grateful for the monumental efforts of the Boston Police Department and the MBTA and Transit police who have worked tirelessly over the last three days to bring Olivia home," the statement read. The family also thanked "all of the staff at Hennessey's Bar who have been so helpful since Olivia went missing" and said they were "also so appreciative of all the efforts, prayers and good wishes of ... friends, family and complete strangers."

Hours before she was found alive Tuesday, investigators released two surveillance images of a person of interest along with a timeline of Ambrose's last known whereabouts. when she had been last seen in a bar on Union Street and when she was last caught on surveillance video in Charlestown.